Interesting concept, if it worked for me.
Sadly, big fiasco despite having the right subscription, elected to be an Insider and selected the Beta channel. I updated my Microsoft and Office 365 (using File > Account in Excel) and then selected the Python group in the Formula Tab of my ribbon. So far, so good, except: (a) Impossible to trigger Python with =PY or by using the Insert Python button in Formulas; (b) The Diagnostics icon in my Python Tab is greyed-out. So, bad start for Microsoft and Python.
Now, I'm already thinking about installing Python, and using Pandas or OpenPyXL, because things should work from the get-go or instructions should be better.
Thoughts about how to make Python in Excel work are welcome. Thanks in anticipation!